133173
Descrição
Mapa Mental por harry_bygraves, atualizado more than 1 year ago
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Criado por harry_bygraves
mais de 11 anos atrás
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Luteal phase
- After ovulation, the remains of the ovarian follicle form the corpus luteum. This yellow glandular
tissue secretes large amounts of progesterone and smaller amounts of oestrogens. These hormones
stimulate further development of the mammary glands and the luteus in anticipation of pregnancy
- If the oocyte is not fertilised within about 36 hours of being shed into
the oviduct, it dies. Following this the corpus luteum gets smaller
with the result that progesterone and oestrogn secretion is reduced.
At day 28, about 14 days after ovulation, lack of progesterone bings
about another menstruation and the cycle begins again
- If the oocyte is fertilised, the zygote is propelled towards the luteus. during its journey it forms an
embryo which becomes implanted in the uterine lining. A placenta forms between the embryo and
mother; this produces human chloride gonadotrophin (HCG) which stpos the degeneration of the
corpus luteum, and menstruation is suspended.In humans menstruation occurs in females from
puberty to menopause, after which there are no more fertile follicles so follicular and ovulation cease.
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